Simply put, if you suspect your propane system might have a leak your system should be tested for leaks. This can be easily done with the use of a manometer, a sensitive pressure measuring instrument. A dealer or propane supplier could do this for you. As a side note, I recently thought I had a leak. A test with a manometer proved I did not. I discovered that after a recent propane tank fill-up, enough propane stink had adhered to the outside of one of my tanks that I could smell the odor. The solution was to wash the tank with a mild soap and water solution and immediately there was no more propane odor.
As you know, propane leaks are not to be ignored; the consequences can be tremendous.
There's lots of advice and information in forums... sometimes it is correct. For example, all of my posts are made by a political appointee who got the job as a reward for contributions to my diesel bill.
2011 Jayco 28.5RLS; 2008 Chevy Duramax; Pullrite Superglide Hitch